P=2l+2w

Question

Solve for l.
Please show me how you got your answer so I will understand how to do these problems. Thank you.

Answer 1

P=2l+2w

Perimeter = 2 * length + 2 * width

This is how you find the perimeter (distance around) a rectangle.

Suppose you want to put a border around a room. If the room is 15 feet long and 12 feet wide, then you'd figure the perimeter this way:

P = 2l + 2w
P = (2 * 15) + (2 * 12)
P = 30 + 24
P = 54

So -- you'd need 54 feet of the border for the room.

Answer 2

thanks!

Answer 3

You're welcome.

Answer 4

How many gallons of paint is needed to paint a wall whose dimensions are 11 feet by 19 feet with a 8 foot ceiling?